Advice to live by – Kill the babies!

A malicious alien race has descended on earth determined to reduce the entire planet to rubble. Little is known about the whereabouts of their covert Caribbean base of operations beyond the vague suspicion that it's located in an underwater lair somewhere within the lost city of Atlantis. Stepping into the breach as the eponymous Aquanaut, the future of humanity rests on our flippers! Accordingly, our crusade to eliminate the threat begins below sea level bedecked in SCUBA gear, armed with a harpoon. Survive a vicious tirade of unprovoked attacks from inhospitable sealife long enough to reach terra firma and the battle switches up a notch, inviting us to engage with the freakshow eye to eye.